在ANSYS的APDL中下列命令啥意思？急求！（下面的asel命令有错吗？）

allsel
asel,s,ext !选择外边的面
cmsel,u,dambot
asel,s,,,4$asel,a,,,8$asel,a,,,12$asel,a,,,16$asel,a,,,20$asel,a,,,24$asel,a,,,28$asel,a,,,32$asel,a,,,36$asel,a,,,95$asel,a,,,99
asel,a,,,108$asel,a,,,116$asel,a,,,124$asel,a,,,132$asel,a,,,140$asel,a,,,148$asel,a,,,156$asel,a,,,164$asel,a,,,175$asel,a,,,189
asel,a,,,211$asel,a,,,214$asel,a,,,221$asel,a,,,241$asel,a,,,264$asel,a,,,280$asel,a,,,295$asel,a,,,358$asel,a,,,419$asel,a,,,422
asel,a,,,428$asel,a,,,433$asel,a,,,475$asel,a,,,488$asel,a,,,504$asel,a,,,547$asel,a,,,607$asel,a,,,611$asel,a,,,613$asel,a,,,619
asel,a,,,627$asel,a,,,631$asel,a,,,635$asel,a,,,639$asel,a,,,704$asel,a,,,708$asel,a,,,757$asel,a,,,766$asel,a,,,775$asel,a,,,780
asel,a,,,930$asel,a,,,939$asel,a,,,944$asel,a,,,945$asel,a,,,982$asel,a,,,1070$asel,a,,,1138$asel,a,,,1147$asel,a,,,1152$asel,a,,,1197
asel,a,,,1217$asel,a,,,1291$asel,a,,,1327$asel,a,,,1381$asel,a,,,1431$asel,a,,,1466$asel,a,,,1533$asel,a,,,1536$asel,a,,,1539$asel,a,,,1578
asel,a,,,1723$asel,a,,,1738$asel,a,,,1742$asel,a,,,1760$asel,a,,,2087$asel,a,,,2103$asel,a,,,2106$asel,a,,,2109$asel,a,,,3437$asel,a,,,3492
asel,a,,,3496$asel,a,,,3502$asel,a,,,3505
!选择基岩正侧的面，注意不要把底面选上

选择全部
选择模型外边的面
不选择dambot的组件
继续选择面号4
继续选择面号8.
。。。。
继续选择面号3505
差不多这样子，里面的那个$是多余的吧，得去掉并且分行